JP3660038B2 - Numerical controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a numerical control device, and more particularly to program execution of an NC machine tool.
[0002]
[Prior art]
In the numerical control device, there is a case where it is necessary to partially rework after machining is completed, or there is a case where the machining range is limited and partial machining is performed. FIG. 9 shows an explanatory diagram when performing such reworking or partial machining. For example, a case is assumed where it is desired to rework or partially process the hatched portion 92 of the workpiece 91 in die machining or the like. At this time, for example, a measure is taken to partially correct the build-up in the hatched portion 92 and process only that portion.
[0003]
At present, in the NC machining program that is generally used, if the machining range is limited in this way, it is necessary to execute the entire program. In this method, since the machining program is executed from the beginning and the whole is machined, it takes a very long time to include a range other than the necessary machining range.
[0004]
Therefore, according to another conventional method, there is a method of executing the machining program from an intermediate step of the machining program by a sequence number search function, a program restart function or the like as a method for limiting the machining range. In addition, there is a method called optional block skip in which a determination symbol (for example, flag “1”) for designating skipping is added in a program block, and the corresponding block is ignored during program execution. Adopted.
[0005]
[Problems to be solved by the invention]
However, in the prior art as described above, it is indispensable to edit or modify the machining program itself in order to execute it from an intermediate step of the program or to add a judgment symbol. Therefore, there is a problem that it takes time to create data.
[0006]
The present invention is intended to solve the above problem, and an object of the present invention is to provide a numerical control device capable of easily realizing partial machining / rework in which an arbitrary region in a machining program is limited.
[0007]
[Means for Solving the Problems]
According to the numerical control device of the present invention,
Machining program storage means for storing command data;
Processing range setting table storage means for setting the processing range;
Control means for comparing the command data with the machining range, executing a command based on the command data when the machining data is within the machining range, and not executing the command when the machining data is outside the machining range;
Drive means controlled by the control means;
It is determined whether the axis movement based on the command data is an axis movement from the outside of the machining range to the inside of the machining range. When it is determined that such an axis movement is such an axis movement line and the machining range, Setting means for obtaining an intersection with the boundary or the vicinity thereof and setting the intersection or the vicinity as a start point.
Moreover, according to the numerical control device of the present invention,
Machining program storage means for storing command data;
Processing range setting table storage means for setting the processing range;
Control means for comparing the command data with the machining range, executing a command based on the command data when the machining data is within the machining range, and not executing the command when the machining data is outside the machining range;
Drive means controlled by the control means;
Display means for displaying the processing range or processing status for partial processing or reprocessing.
[0008]
The control means compares the axis movement range based on the command data with the machining range when executing the program based on the command data in the machining program storage means, and the axis movement range is all included in the machining range. If this is the case, the axis movement is executed as it is. If only part of it is included, it is converted into command data within the machining range and the axis movement is executed. Can be.
[0009]
Furthermore, it is preferable to further include an input means for inputting a machining range, an input means for inputting a start point, or a setting means for automatically setting the start point for partial machining or rework.
[0010]
In the numerical control device of the present invention, a machining range setting table for each axis is provided, and when the machining program is executed with each command data, each axis movement range and the machining range stored in the machining range setting table are set to each command data. Always compare and execute every time. If the entire axis movement range based on the command data is included in the machining range, the axis movement is executed as it is. On the other hand, if it is outside the machining range, the axis movement is not executed, so that the program analysis process is executed without changing the program and the program is within the set machining range. The machining program can be executed in real time, and partial machining / re-machining in which an arbitrary area in the machining program is limited can be easily realized.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, some of the embodiments of the present invention will be described in detail.
[0012]
FIG. 1 is a block diagram of a numerical control apparatus according to an embodiment of the present invention.
[0013]
The numerical control device 1 includes an NC machining program storage unit 2, an NC machining program analysis execution unit 3, a machining range setting table storage unit 4, an output control unit 5, and an output interface unit 6. A drive unit 7 is connected to the output interface unit 6. Also, an input unit 8 for inputting various programs and data and a display unit 9 for displaying are provided.
[0014]
The NC machining program storage unit 2 stores command data that is information for instructing the operation of the machine for each block. As these command data, either an ISO code or an EIA code defined in JIS B 6311 is usually used. For example, the NC machine tool command data includes G function (control function, preparation function), M function (auxiliary function), F function (feed function), dimension words X, Y, Z (X axis, Y axis, Z Axis motion dimensions).
[0015]
The NC machining program analysis execution unit 3 is composed of a microcomputer or the like, sequentially reads and analyzes the command data stored in the NC machining program storage unit 2 block by block, and is further stored in the machining range setting table storage unit 4. A predetermined operation is performed with reference to the stored data.
[0016]
The processing range setting table storage unit 4 stores data necessary for limiting the processing range. The setting of the processing range data can be appropriately input by the input device 8.
[0017]
The output control unit 5 instructs the rotation number, rotation angle, rotation speed, movement width, movement speed, and the like of a predetermined drive unit 7 according to a command from the NC machining program analysis execution unit 3.
[0018]
The output interface unit 6 distributes the command of the feed speed position control unit 5 to a predetermined drive unit 7.
[0019]
The drive unit 7 includes a rotating unit or a moving unit of an NC machine tool using a feed motor or the like. The drive unit 7 usually has a servo mechanism and is constituted by a plurality of drive devices. A predetermined drive unit 7 is driven by a command signal sent via the output interface unit 6, and the positioning, movement width, movement speed, rotation speed, etc. of the NC machine tool are controlled.
[0020]
The input unit 8 is a known input device such as a keyboard and a mouse, and inputs programs or data in the NC machining program storage unit 2 and the machining range setting table storage unit 4. It is also possible to make inputs for maintenance, countermeasures against troubles, and the like.
[0021]
The display unit 9 includes a display device such as a CRT or a liquid crystal display, and can display various data, programs, and the like. In addition, by providing a two-dimensional or three-dimensional graphic function, a processing range, a processing status, and the like can be displayed as required by an overall processing diagram or a partial processing diagram.
[0022]
Next, an outline of the operation of such a numerical control apparatus will be described.
The NC machining program analysis executing unit 3 outputs a command signal based on data in the NC machining program storage unit 2 and referring to the machining range setting table storage unit 4. That is, when the machining program is executed by each command data, each axis movement range and the machining range stored in the machining range setting table are always compared and executed for each command data. If the entire axis movement range based on the command data is included in the machining range, the axis movement is executed as it is. On the other hand, if it is outside the machining range, the axis movement is not executed. The determination whether it is within the machining range or outside the machining range and the conversion process when executing will be described in detail later. In response to this command signal, the feed speed position control unit 5 commands the rotation speed, rotation angle, rotation speed, and the like of the feed motor 7 via the output interface unit 6, thereby positioning and moving speed of the NC machine tool. Control etc.
[0023]
In this way, it is possible to easily perform partial machining / rework only within an arbitrary machining range set in the machining range setting table storage unit 4 in the data of the NC machining program storage unit 2.
[0024]
FIG. 2 shows an example of the NC machining program stored in the NC machining program storage unit 2. Here, the block number 00 indicates that the initial state moves to the X coordinate 2500 and the Y coordinate −2000 as a preparation function. In block number 01, a predetermined moving speed is set by linear interpolation. Block number 03 indicates movement to X coordinate 2500 and Y coordinate 2500. A block number 04 indicates that the movement is performed with no change in the X coordinate 2000 and the Y coordinate. Thereafter, up to the block number 22, the X coordinate and the Y coordinate are respectively moved to predetermined values. Finally, block number 23 indicates the end of the program.
[0025]
FIG. 3 shows an example in which a rectangular processing range is set in the processing range setting table set in the processing range setting table storage unit 4. Here, a data table format in which the processing range is set by storing the coordinate value data of the four corners of the rectangle is shown.
[0026]
FIG. 4 shows a detailed flowchart of the machining operation according to the present invention.
First, command data of block numbers 00 and 01 in the NC machining program are sequentially input to perform initial setting (S10). Next, the machining range data of the machining range setting table is input (S20). Next, the NC machining program is sequentially input block by block (S30). Here, when the program end command is input as in the command data of block number 23 (S40), the execution ends. Next, it is analyzed whether or not the axis movement range based on the command data is included in the machining range set in the machining range setting table (S50). For example, in this analysis, the movement range is obtained from both the previous coordinate value and the coordinate value input this time, and the movement range is compared with the machining range data in the machining range setting table to determine whether it is within the machining range. It can be analyzed by judging whether or not. As a result of the analysis, if the entire axis movement range based on the command data input this time is included in the machining range, it is executed as it is (S60). On the other hand, if the axis movement range is not always included in the machining range, only a part of the axis movement range is included in the machining range, i.e., it extends over the machining range and outside the machining range, or no machining is performed. If it is not included in the range, that is, whether it is out of the processing range is analyzed (S70). Here, when only a part of the axis movement range is included in the machining range, the command data is temporarily converted so that the axis movement range falls within the machining range. As this specific conversion method, for example, the NC machining program analysis execution unit 3 or the like appropriately calculates so as to move only to or near the end of the machining range set in the machining range setting table. Can be converted. On the other hand, if the moving range is not included in the machining range at all, the next NC machining program is input with the command data invalidated and left unexecuted (S30).
[0027]
According to such a flowchart, the program in FIG. 2 is specifically executed as follows.
(1) If the data is not set in the process execution machining range setting table for the entire machining range, the process for the entire machining range is performed. That is, in step S50, each command data is within the machining range, and it is determined YES. Accordingly, all command data is executed in the next step S60. In this way, the axis movement is executed along a locus such as positions B00 to B23 shown in FIG. 5 according to the command data of each block of the NC machining program of FIG. Here, the position Bnm corresponds to the command data by the block number nm in FIG. Further, the soft stroke limit is a limit range when machining by command data.
(2) When data is set in the process execution machining range setting table by machining range designation, a partial machining process is performed. FIG. 6 shows an explanatory diagram of automatic conversion of NC machining program command data when the machining range is set, and FIG. 7 shows an explanatory diagram showing the axis movement locus.
[0028]
When command data of block numbers 00 and 02 to 09 in FIG. 2 are input, it is determined that the processing range is outside the processing range of the processing range setting table in steps S50 and S70, and the processing is not executed. Since the command data of block number 01 does not include an axis movement command, a moving speed or the like is set as appropriate. Next, returning to step S30, the command data of the next block number 10 are sequentially input. When the command data of block number 10 is input, according to steps S50 and S70, the axial movement range from the position B09 to the position B10 is partially included in the machining range, that is, extends within and outside the machining range. It is judged. Accordingly, in step S80, the command data of block number 10 is automatically converted into command data (X500, Y2000) instructing to move to the outer peripheral end within the machining range without moving to the position B10, so that the machining range is obtained. The axis is moved to the position B′10. Next, when command data of block number 11 is input, it is command data for movement in the X direction to the X coordinate 0 based on the position B′10 based on the converted command data. Since they are all included in the processing range, they are executed as they are in step S60. Similarly, the command data of the block number 12 is converted into (X0, Y500) and moved to the position B′12. Similarly, the command data is automatically converted into the positions B′13, B′14, to B′15. It is executed as it is, and the axis is moved within the machining range. The command data of block numbers 17 to 22 are not executed because the axis movement range is not included in the machining range at all, that is, outside the machining range. Finally, the NC machining program is terminated by a program end command of block number 23.
[0029]
In addition, when executing a program by specifying the machining range of the NC machining program, each position to be positioned before the machining program is executed by operating the machining range designation menu or an input unit such as a key switch before the NC machining program is executed. An axis coordinate value can also be input. Further, as each axis coordinate value, one of the machining range data in the machining range setting table may be used. In this case, for example, after the start position is first set at an arbitrary position, the program within the machining range can be executed. FIG. 8 shows an example of this. Here, the position P1 is used as a starting point for partial machining or reworking.
[0030]
As a method for automatically setting the start point, it is first determined whether or not the axis movement based on the command data is an axis movement from the outside of the machining range to the inside of the machining range. Next, when it is determined that it is such an axial movement, an intersection or its vicinity between the axis movement line and the boundary of the machining range can be obtained, and the intersection or the vicinity can be set as a starting point. For example, as shown in FIG. 8, in order to automatically set the position P1 or the vicinity thereof as a starting point, first, the axis movement from the position B09 to the position B10 is an axis movement from outside the processing range to within the range. Judge that there is. Next, this axis movement can be performed by obtaining an intersection point that enters the machining range region and setting the intersection point or the vicinity thereof as a start point.
[0031]
In the above embodiment, the description has been made only with the X and Y coordinate values, but it is also possible to apply to three dimensions having X, Y and Z coordinates. The present invention can be applied not only to axis movement commands but also to partial execution of any program execution other than NC machining programs.
[0032]
【The invention's effect】
As described above, according to the numerical control device of the present invention, the machining range setting table for each axis is provided, and when the machining program is executed with each command data, the machining range stored in each axis movement range and the machining range setting table is stored. The range is always compared for each command data, and if the axis movement range based on the command data is completely included in the machining range, the axis movement is executed as it is, and if only a part is included, that is, inside or outside the machining range. If it crosses, it is converted into command data within the machining range and the axis is moved. On the other hand, if it is outside the machining range, the axis movement is not executed. While executing processing, machining programs within the set machining range can be executed in real time, making it easy to perform partial machining and re-machining in a limited area within the machining program. It is possible to present.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a numerical controller according to the present invention.
FIG. 2 is an explanatory diagram of an NC machining program stored in an NC machining program storage unit 2;
FIG. 3 is a processing range setting table set in a processing range setting table storage unit 4;
FIG. 4 is a flowchart of processing range operation.
FIG. 5 is an explanatory diagram of axis movement for process execution in the entire machining range.
FIG. 6 is an explanatory diagram of machining program conversion by machining range designation.
FIG. 7 is an explanatory diagram of axis movement for process execution by specifying a machining range.
FIG. 8 is an explanatory diagram of axis movement for process execution by specifying a machining range when a start point is set.
FIG. 9 is a schematic view of reworking / partial machining.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Numerical control apparatus 2 NC process program memory | storage part 3 NC process program analysis execution part 4 Process range setting table memory | storage part 5 Output control part 6 Output interface part 7 Drive part 8 Input part

Claims (4)

Machining program storage means for storing command data;
Processing range setting table storage means for setting the processing range;
Control means for comparing the command data with the machining range, executing a command according to the command data when the machining data is within the machining range, and not executing the command when the machining data is outside the machining range;
Drive means controlled by the control means;
It is determined whether the axis movement based on the command data is an axis movement from the outside of the machining range to the inside of the machining range. A numerical control apparatus comprising: a setting unit that obtains an intersection with the boundary or the vicinity thereof and sets the intersection or the vicinity as a start point. Machining program storage means for storing command data;
Processing range setting table storage means for setting the processing range;
Control means for comparing the command data with the machining range, executing a command according to the command data when the machining data is within the machining range, and not executing the command when the machining data is outside the machining range;
Drive means controlled by the control means;
A numerical control device comprising display means for displaying the processing range or processing status for partial processing or reprocessing.   The control means compares the axis movement range based on the command data with the machining range when executing the program based on the command data in the machining program storage means, and the axis movement range is all included in the machining range. If this is the case, the axis movement is executed as it is. If only part of it is included, it is converted into command data within the machining range and the axis movement is executed. The numerical control apparatus according to claim 1, wherein:   The numerical control device according to claim 1, wherein the control unit obtains the axis movement range from a coordinate value of the previous command data and a coordinate value of the current command data.

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